campbell, and the third victim identified just today, boston university graduate student lingzi lu, a native of china. there may be as many as a thousand agents assigned to this case. tonight there's a sense from many of them that they're getting much closer. >> brian, thank you. >>> we want to bring in richard clark, who is was a national counterterrorism adviser at the white house under two administrations. >> there's good news there apparently that they have some faces. so we may be in one of those cases that gets cracked quickly. to. too early to tell yet. >> you reminded us that they put back together the plane at lockerbie pan am 103. >> it was a 747 that blew up at altitude, spread over a hundred square miles. the fbi put that plane back together just as they are today putting the bombs back together. >> i know you'll be standing by with us throughout the evening as we bring everyone the latest developments. >> now we turn next to that breaking news in the dangerous drama unfolding out of washington, d.c. wonder of an arrest in the case of those letters that appear to have be